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$3 a - 2 b + 5 c, 2 a + 5 b - 7 c, - a - b + c$

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Solution

We have, $(3 a - 2 b + 5 c) + (2 a + 5 b - 7 c) + (- a - b + c)$
$= 3 a + 2 a - a - 2 b + 5 b - b + 5 c - 7 c + c$
$= 5 a - a - 3 b + 5 b + 6 c - 7 c$
$= 4 a + 2 b - c$

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